Re: [IMail Forum] AT&T blocking SMTP port?

[elemental]

At 02:07 PM 5/30/00 , Kevin Childers wrote:
>
>    Not All ISPs are doing this, how ever it seems to be a popular way to
>reduce Spam traffic and require users to only utilize the ISPs mail
>services.  It will reduce some spamming but I doubt it will do so to any
>noticeable degree.

Once a majority of the larger ISPs start doing it you will see the
difference. By "large" I mean the ones that are leasing UUNET/PSI/etc POPs
to provide nation-wide access.

Take GTE for example. GTE utilizes UUNET POPs. What's stopping a customer
of another ISP who also uses UUNET from spamming through GTE's SMTP server?
At the moment nothing, because the block of IP addresses assigned by that
POP need to be approved by GTE's SMTP server so their own users can send mail.

Port 25 filtering, once it's more widely done, will solve this problem.



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